摘要:
该文系统地阐述了星载ScanSAR系统的基本工作原理,由ScanSAR系统的空间几何模型,确定了ScanSAR系统各子条带的空间位置,研究了ScanSAR系统的方位分辨率问题,确定了ScanSAR系统工作的时间关系,各子条带的脉冲重复频率的选择及每个burst的样本数,为系统设计提供了依据。重点研究了 ScanSAR系统的信噪比及距离模糊问题,提出了一种新的 ScanSAR系统特有的模糊概念ARASR,并提出新的分析方法,对其影响做了定量的计算,最后对 ScanSAR系统的数据下载格式提出了建议。
Abstract:
Based on the principles of the space-borne ScanSAR, some important parameters to define the position of sub-swathes, the timing sequence of the system, the choice of the PRFs, the number of the samples of each burst and the SNR are investigated. Some critical problems about ScanSAR system are discussed, such as the number of the multi-looks, the azimuth resolution and the range ambiguities. A new concept of the range ambiguities is put forward, analyzed and verified. Based on above discussion and calculation, the data format for the practical ScanSAR system is suggested.
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